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@article{MZM_1973_13_4_a8, author = {G. A. Isaev}, title = {The linear factorization of polynomial operator pencils}, journal = {Matemati\v{c}eskie zametki}, pages = {551--559}, publisher = {mathdoc}, volume = {13}, number = {4}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_4_a8/} }
G. A. Isaev. The linear factorization of polynomial operator pencils. Matematičeskie zametki, Tome 13 (1973) no. 4, pp. 551-559. http://geodesic.mathdoc.fr/item/MZM_1973_13_4_a8/